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The Fermi effective Lagrangian is written

(75) 
where the total weak current can be separated in the sum of the
leptonic weak current and the hadronic weak current

(76) 
For the leptonic current it can be written
where its structure of the type is evident in the factor
It is also usual to separate the Lagrangian (77) in the form

(79) 
each part corresponding to a given type of processes. In fact,

(80) 
is referred to purely leptonic weak processes. While

(81) 
is
the part corresponding to semileptonic reactions. It is worth
noticing that in the case of the lepton , having a mass
almost equivalent to two protons, there exist the possibility of
semihadronic decays. Finally

(82) 
will describe the purely hadronic processes.
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